As filed with the Securities and Exchange Commission on October 27, 2023 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 iBio, Inc. (Exact name of registrant as specified in its charter) Copies to: Leslie Marlow, Esq. Patrick J. Egan, Esq. Melissa Palat Murawsky, Esq. Hank Gracin, Esq. Blank Rome LLP 1271 Avenue of the Americas New York, New York 10020 (212) 885-5000 Ron Ben-Bassat, Esq. Sullivan & ...